Rotary shearing and other hand-operated tool



@mum 1924.

E.l M'. SMITHl 1 RO'I'APE SHEARING AND OTHER HAND OVPERATED TOOL lyFiled June 13 1924V Patented @et ld,- ld'li,

iaiti ROTARY SHEARING ANB HANDPERATED TOOL.

Application led June 13, 1.924. Serial No.v 719,751.

To all whom t may concern.'

Be it known that l, Eine lVloNTaeUE SMITH, a subject oit' the King oiGreat Britain, residing at Sigers, lilastcote, in the county ofMiddlesex, England, have invented certain new and useful improve`- mentsin or Relating to Rotary Shearing and other Hand-perated Tools, ot whichthe following is a specification.

'lhis invention relates to hand-operated rotary shearing tools havingeither or both of the rotary cutters peripherally milled or dentated andthe invention has reference more particularly to new or improved arrangements for actuating, or applying the driving torce to, such tools.

According to the present invention, instead of employing the usual pawland ratchet wheel as the driving means, l apply the driving force directto the milled or dentated periphery of one or both of the rotary cuttersby ineans of a member or members adapted for direct engagementtherewith. Such drive is positive in action and has the advantage (interalia) over the usual arrangement of enabling the operator to make veryshort strokes with the driving lever or handle where such is desirableor necessary for example when operating the tool in a limited space suchas a corner or in an angle where any great angular movement of thedriving lever would be diiiicult or impossible.

Furthermore the use of this invention considerably cheapens the cost otmanufacture of such shearing tools, since the addi tional pawl andratchet wheel on one or each oi' the cutters are dispensed With.

The present invention will be more clearly understood by reference tothe accompanying drawings wherein Fig. l is a front view in elevationand Fig. 2 is a side view in elevation of a hand-operated rotaryshearing tool having one driven and one free ruiming cutter.

ln these drawing-sz A and B designate two peripherally milled ordentated rotary cutters mounted in the usual manner in the frame C o'l'a rotary shearing tool. A pair of links or cheeks D are rotativelymounted on the spindle A1 of the cutter A, and between these cheeks l)towards the other end thereof is pivoted a driving element E secured tothe operating lever or handle F. This driving element E may terminate atits lower end in a sharp nose or tooth E1 (as shown) or the said memberE may be serrated or milled over the whole or a part of the undersurface thereof so as to enga-ge simultaneously a plurality of thedentations o-n the driven cutter A. A stop or abutment (l is provided onone of the cheeks D to limit the backward movement of the drivingelement E upon the rearward or idle. stroke ot the handle F, so as toprevent engagement oi' said driving element E with the rutter A duringsuch rearward stroke.

The periphery ot' the driven cutter or of both said cutters may be ofany usual or suitable coniiguration in section, e. g. per 'fectly tlator il-shaped, the engaging part of the driving element E being formed tocorrespond.

The driving means according to this invention may obviously be appliedto both oi the rotary cutters in a portable shearing tool having twooperating handles.

l. A shearing tool comprising a frame, a plurality of rotary cuttersmounted therein with their cutting edges in operative relation withrespect to one another', one of said cutters having its peripherydentated, and a pivoted operating lever carried by the frame and adaptedto engage the dentations oi the cutter whereby to drive the same.

2. A hand operated rotary shearing tool comprising a peripherally milledor dentated driven cut-ter, a freely running rotary cutter co--actingtherewith, a driving element adapted ttor direct engagement with theperiphery of said driven cutter upon the driving stroke and means,movable about the axis of the drive-n cutter, to support said drivingelement.

8. A hand operated rotary shearing tool according to claim 2 having thedriving element pivotally mounted with respect to its supporting frameso as to be capable of movement towards and away from the periphery ofthe driven cutter upon. the

driving and the return stroke respectively of the operating handle.

hi. A shearing tool comprising a frame, a freely rotatable cuttermounted therein, a driven cutter rotatably mounted in operative relationwith respect to the first mentioned cutter, and provided withindentations on its periphery, a pivoted operating lever mounted inoperative relation with respectv to the driven cutter, and a tooth Y tgli Y' Carried by the lever. and` adapted lto enga-ge the dentation ofthey Cutter When the lever is moved on its pivot,-vvhereby to drive thecutter. f

5.` A shearing tool comprising afraine, a

,freely rotatableontter mounted therein, a. driven cutter mountedV inoperative relation for pivotal movement about the axis thereof, anoperating lever pivotally carried by the links in operative relationWith respect to the dentated periphery of the cutter, a tooth carried bythe lever and adapted to engage the dentations of the. cutter When thelever is operated, and a lug carried by one of the links to limit thepivotal movement of the lever.

ERIC MONTAGUE SMTH.

